A woman and her granddaughter sit at their tent at a makeshift camp for migrants and refugees at the Greek-Macedonian border near the village of Idomeni on April 27, 2016. Some 54,000 people, many of them fleeing the war in Syria, have been stranded on Greek territory since the closure of the migrant route through the Balkans in February. (Photo by Joe Klamar/AFP Photo)

In this Thursday, April 14, 2016 photo, Pakistani Sikh women wait at a police barrier to attend a religious festival known as Beshakhi in Hasan Abdal, Pakistan. Earlier this month, the gurdwara in Peshawar's crowded Old City opened its doors to worshippers for the first time in 73 years. The reopening was celebrated by Pakistan's tiny Sikh minority, but security is a constant concern. (Photo by B.K. Bangash/AP Photo)

A street vendor wipes the sweat from his face as he cooks food in central Bangkok, Thailand, Wednesday, April 27, 2016. April in Thailand is typically hot and sweaty but this year's scorching weather has set a record for the longest heat wave in at least 65 years. The Department of Disease Control has warned people to beware of food poisoning and other food-related illnesses that typically increase during hot weather when bacteria can thrive on unrefrigerated food. (Photo by Mark Baker/AP Photo)

NASA's last space shuttle external tank makes its way through the Miraflores locks of the Panama Canal in Panama City April 26, 2016. The external tank is crossing the Panama Canal on its way to a display venue in California, according to local media. (Photo by Carlos Jasso/Reuters)

Actress Priyanka Chopra poses for photographers on the red carpet as she arrives for the TIME 100 Gala in Manhattan, New York, April 26, 2016. (Photo by Shannon Stapleton/Reuters)

Recording artist Nicki Minaj poses for photographers on the red carpet as she arrives for the TIME 100 Gala in Manhattan, New York, April 26, 2016. (Photo by Shannon Stapleton/Reuters)

American alpine ski racer Lindsey Vonn poses for photographers on the red carpet as she arrives for the TIME 100 Gala in Manhattan, New York, April 26, 2016. (Photo by Shannon Stapleton/Reuters)

A man runs on a snow covered path in Gnadenwald, Austria, April 27, 2016. (Photo by Dominic Ebenbichler/Reuters)

Members of the Samaritan sect take part in a traditional pilgrimage marking the holiday of Passover on Mount Gerizim, near the West Bank city of Nablus, April 27, 2016. (Photo by Abed Omar Qusini/Reuters)

A Palestinian woman argues with an Israeli border policeman near the scene where a Palestinian woman and a man, who the Israeli military said tried to stab security forces, were shot dead by Israeli police near Qalandia checkpoint near the West Bank city of Ramallah April 27, 2016. (Photo by Ammar Awad/Reuters)

An Afghan National Army (ANA) tank is parked at an outpost in Kunduz province, Afghanistan April 18, 2016. (Photo by Reuters/Stringer)

A student activist is detained during a silent protest after Thailand's election commission filed charges against a group for posting “foul and strong” comments online criticising a military-backed draft constitution, in Bangkok, Thailand April 27, 2016. (Photo by Jorge Silva/Reuters)

A SpaceX dragon capsule is shown on the surface of Mars in this artist's concept photo provided April 27, 2016. Elon Musk, the company's billionaire founder and chief executive, announced Wednesday via Twitter that he plans to send a Dragon capsule to land on the red planet as early as 2018. It would represent a big first step toward his ultimate goal of colonizing the red planet. The Mars spacecraft will be called Red Dragon, Musk said. No astronauts will accompany Red Dragon on this first test flight. Musk said the upgraded Dragon is designed to land anywhere in the solar system. The propulsive landing system was tested recently at the SpaceX plant in McGregor, Texas. Red Dragon would be launched aboard a mightier version of the current SpaceX Falcon rocket that may make its debut at Florida's Kennedy Space Center by year's end. (Photo by Reuters/SpaceX)

A 3D-printed Sanpang strawberry milk flavoured ice-cream is seen at the Iceason ice-cream shop in Shanghai, China, April 27, 2016. Sanpang is a Chinese nickname for North Korean leader Kim Jong Un. (Photo by Aly Song/Reuters)

A member of the self-proclaimed Donetsk People's Republic forces stands near the wreckage of a car destroyed in explosions in the rebel-controlled village of Yelenovka outside Donetsk, Ukraine, April 27, 2016. (Photo by Alexander Ermochenko/Reuters)

A National Heritage Trust historical re-enactor looks out of a gun port after firing his rifle during a re-enactment of Victorian-era British Army garrison life at the Fort Rinella coastal battery, built in 1878, in Kalkara, outside Valletta, Malta, April 27, 2016. (Photo by Darrin Zammit Lupi/Reuters)

A demonstrator with physical disability falls from a wheelchair during a protest to demand that the government increase the monthly disability subsidy in La Paz, Bolivia April 27, 2016. (Photo by David Mercado/Reuters)

French President Francois Hollande delivers a speech next to French Foreign Minister Jean-Marc Ayrault during a visit to the French naval defence contractor DCNS headquarters in Paris on April 26, 2016. France beat off competition from Germany and Japan to win a Aus$50 billion (US$39 billion) contract to design and build Australia's next generation of submarines, a decision Tokyo called “deeply regrettable”. (Photo by Christophe Petit Tesson/AFP Photo)

Bubble gum dumped from a bucket falls near the head of Minnesota Twins' Miguel Sano after his walk-off single gave the Twins a 6-5 win over the Cleveland Indians in a baseball game Tuesday, April 26, 2016, in Minneapolis. (Photo by Jim Mone/AP Photo)

Parts for the prosthetic limbs, mostly manufactured in Turkey, are stored at a clinic in the Turkish border town of Reyhanli, where hundreds of wounded Syrians come in every week to receive prosthetic limbs, Wednesday, April 20, 2016. Treatment at the clinic is free and only for Syrian civilians and fighters who lost their limbs in the war in their home country. (Photo by Bram Janssen/AP Photo)

Italy's Valentina Vezzali (L) competes with Russia's Larisa Korobeynikova during the test event of the Fencing World Championships Women's Foil Team final match for the Rio 2016 Olympic Games at the Carioca Arena 3 of the Olympic Park in Rio de Janeiro, Brazil, on April 26, 2016. (Photo by Yasuyoshi Chiba/AFP Photo)

Former Olympic champions Nastia Liukin, right, and Carl Lewis ride a zip line through Times Square in New York, Wednesday, April 27, 2016. These athletes and many others were participating in an event called “Team USA's Road to Rio” to promote the upcoming Olympic Games. (Photo by Seth Wenig/AP Photo)

An injured person sits in an ambulance after a suicide bomb attack outside the historical tourist destination at Ulu Cami in Bursa, Turkey, Wednesday, April 27, 2016. The office of the governor of Bursa said in a statement carried by the state-owned Anadolu Agency that a woman believed to be a suicide bomber blew herself up. (Photo by IHA Agency via AP Photo)

A man shouts slogans against South African President Jacob Zuma and the ruling African National Congress (ANC) party during a protest organized by the opposition political parties, Civil Society organizations and Religious group as the nation celebrates Freedom Day in Johannesburg on April 27, 2016. (Photo by Gianluigi Guercia/AFP Photo)

A protester wears eye-lenses with radioactive signs, as she participates in a rally to mark the 30th anniversary of the Chernobyl nuclear disaster in Minsk, Belarus, 26 April 2016. The 30th anniversary of the Ukrainian, Chernobyl nuclear disaster is marked on 26 April 2016. (Photo by Tatyana Zenkovich/EPA)

Spanish Ion Izagirre Insausti of team Movistar in action during the prologue, a 3.95 km individual time trial, at the 70th Tour de Romandie cycling race in La Chaux-de-Fonds, Switzerland, 26 April 2016. (Photo by Jean-Christophe Bott/EPA)

A child of a farmer from the drought affected districts of Maharashtra plays with the toy car at a temperory refugee camp in Mumbai, India, 26 April 2016. According to reports, 21 districts in Maharashtra are drought-affected. Hundreds of people are staying in a refugee camp in Mumbai, migrated from the drought affected area in Maharashtra. (Photo by Divyakant Solanki/EPA)

An Indian paramilitary soldier stands guard during restrictions imposed by government in Srinagar, Indian controlled Kashmir, Wednesday, April 27, 2016. Government forces Wednesday imposed vehicle traffic restrictions in some parts of valley after separatists in the Kashmir Valley called for mass funeral prayers for Jammu and Kashmir Liberation front or JKLF founder and supporter of armed struggle Amanullah Khan, 86, who died at a Rawalpindi hospital in Pakistan on Tuesday. (Photo by Mukhtar Khan/AP Photo)

A woman and a young boy cover part of their noses as the walk past a massive carcass of a whale at a popular California surfing spot Tuesday, April 26, 2016, in San Clemente, Calif. Authorities are trying to decide what to do with the massive, rotting carcass. (Photo by Lenny Ignelzi/AP Photo)

Indonesian students clash with police officers during an anti-tobacco protest outside the venue of the World Tobacco Process and Machinery Exhibition Asia 2016 in Jakarta, Indonesia, 27 April 2016. At least a hundred students staged a rally demanding the government to stop the exhibition, saying that it promotes smoking among youth and children. Indonesia ranks third in the world for the number of smokers after China and India, according to the World Health Organization. (Photo by Mast Irham/EPA)

German Chancellor Angela Merkel (C) wears a “smart” jacket next to a group of students during a Girls' Day event held at the Federal Chancellery in Berlin, Germany, 27 April 2016. The jacket displays the temperature and reacts to pickpocketing. (Photo by Kay Nietfeld/EPA)

A second century C.E. Buddhist sculpture is displayed during a news conference in the office of the Manhattan District Attorney, in New York, Wednesday, April 27, 2016. Prosecutors returned the sculpture to the government of Pakistan after a Japanese antiquities dealer pleaded guilty to smuggling it into the U.S. The 70-year-old art dealer said he was motivated partly by a desire to protect Buddhist art from being neglected or destroyed in Pakistan. (Photo by Richard Drew/AP Photo)

The interior of Lloyd's of London, the centuries-old insurance market, is pitctured in central London on April 27, 2016. Lloyd's argued on March 23, 2016, that Britain's continued EU membership would be the “better outcome” for the group in the looming June referendum. Lloyd's, which made the comments in its annual report alongside news of tumbling 2015 profits, added that it was making contingency plans for a so-called Brexit. (Photo by Leon Neal/AFP Photo)

A Greek police officer gives a flyer to a child at a makeshift camp the northern border point of Idomeni, Greece, Wednesday, April 27, 2016. Greek police on Wednesday handed out flyers to migrants and refugees at Idomeni, asking them to leave the camps and use other facilities. (Photo by Gregorio Borgia/AP Photo)

Storms clouds form above the Amtrak Station in Kirkwood, Mo., Tuesday, April 26, 2016. (Photo by Robert Cohen/St. Louis Post-Dispatch via AP Photo)

People dance in traditional outfits at the annual Festa Confederada, or Confederate Party, on April 24, 2016 in Santa Barbara d’Oeste, Brazil. The festival is put on by Brazilian descendants of families who fled from the southern United States to Brazil during Reconstruction, between 1865 and 1875, following the end of the U.S. Civil War. Thousands attend the festival which is held at the American Cemetery, or Cemiterio dos Americanos, where graves of settlers and descendants remain to this day. The festival features traditional Southern-style dancing, music and cuisine. The U.S. settlers eventually assimilated with local Brazilians and some now are racially mixed while many others no longer speak English. Organizers say the festival represents familial tradition, ancestral heritage and happiness and is not associated with the negative connotations of the Confederacy. The flag carries no stigma or political meaning in Brazil. (Photo by Mario Tama/Getty Images)

Flames rise and black smoke fills the air after a fire broke out at the Biomax Fuels Ltd. near Vishakhapatnam, a port city in Andhra Pradesh state, India, Wednesday, April 27, 2016. The biofuel manufacturing plant caught fire Tuesday night, triggering explosions in biodiesel tanks and forcing around 150 workers to flee the facility, officials said Wednesday. (Photo by Press Trust of India via AP Photo)

People look at industrial equipment during the Ritchie Bros. auction in Nisku, Alberta, Tuesday, April 26, 2016. Ritchie Bros. is holding what it says is the largest-ever Canadian industrial auction this week – a selloff of more than 10,000 items, including many pieces of idled equipment from the country's battered energy sector. (Photo by Codie McLachlan/The Canadian Press via AP Photo)

One of the shop owners Anjo Joaquin picks up a ukelele to be shown to a customer in suburban Quezon city, north of Manila, Philippines on Wednesday, April 27, 2016. The handmade ukelele's from Cebu and Pampanga province are being sold for P1,500 to P7,500 (about US$ 32 to $160). (Photo by Aaron Favila/AP Photo)

Priestesses dance around the Olympic flame burning in a cauldron, during the handover ceremony at thePanathinean stadium in Athens, on April 27, 2016. Greece on April 27 handed over to Brazilian officials the Olympic flame of the Rio Games as the 100-day countdown to the August 5 opening ceremony begins. (Photo by Aris Messinis/AFP Photo)